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  • Title: RECONSTRUCTION OF THE RADIOACTIVE CONTAMINATION OF THE TERRITORY OF UKRAINE BY IODINE-131 DURING INITIAL PERIOD OF THE CHORNOBYL ACCIDENT USING THE RESULTS FROM NUMERICAL MODEL WRF.
    Author: Talerko MM, Lev TD, Drozdovitch VV, Masiuk SV.
    Journal: Probl Radiac Med Radiobiol; 2020 Dec; 25():285-299. PubMed ID: 33361841.
    Abstract:
    OBJECTIVE: To reconstruct the 131I activity concentrations in air and 131I ground deposition densities from 26 April to7 May 1986 from the radioactivity release after the Chornobyl accident in the settlements of Ukraine using themesoscale radionuclides atmospheric transport model LEDI and meteorological information from the numericalweather forecast model WRF and to compare the obtained results with those calculated previously as well as withavailable measurements of 131I activity in soil.Object of research: the near-ground layer of the atmosphere and the surface of the territory of Ukraine radioactively contaminated as a result of the Chornobyl accident.Materials and methods of research. The dispersion of 131I in the atmosphere and deposition on the ground surfacein Ukraine were calculated using the Lagrangian-Eulerian diffusion model LEDI. The detailed fields of meteorological parameters calculated using the mesoscale weather forecast model WRF, which was adapted for the territory ofUkraine, were used as input data for the LEDI model. RESULTS: The 131I daily-average activity concentrations in the surface air and 131I daily ground deposition densitiesfrom 26 April to 7 May 1986 were calculated using the up-to-date mesoscale model of numerical weather forecastWRF for 30,352 settlements in entire Ukraine, including 1,263 settlements in Kyiv, 1,717 - in Zhytomyr and 1,570 -in Chernihiv Oblasts. CONCLUSIONS: The method of mathematical modeling of the atmospheric transport of the radionuclides is combination with the up-to-date mesoscale model of numerical weather forecast WRF is a useful tool for reconstruction ofradioactive contamination of the air and the ground surface after the Chornobyl accident. Calculated in this study131I activity concentrations in air and 131I ground deposition densities were used to reconstruct the thyroid doses dueto 131I intake to the population of Ukraine. Meta: vykonaty rekonstruktsiiu dynamiky vypadan' 131I ta ïkhnikh ob’iemnykh kontsentratsiĭ u povitri v gostryĭ periodChornobyl's'koï avariï v naselenykh punktakh Ukraïny za dopomogoiu mezomasshtabnoï modeli atmosfernogo perenesennia padionuklidiv LEDI z vykorystanniam rezul'tativ rozrakhunkiv chysel'noï modeli prognozu pogody WRF viakosti vkhidnoï meteorologichnoï informatsiï; porivniaty otrymani rezul'taty z rezul'tatamy poperedn'oï rekonstruktsiï ta naiavnymy danymy vymiriuvan' zabrudnennia ґruntu.Ob’iekt doslidzhennia: nyzhniĭ shar atmosfery i zemna poverkhnia terytoriï Ukraïny, radioaktyvno zabrudnenivnaslidok Chornobyl's'koï avariï.Materialy ta metody doslidzhennia. Za dopomogoiu lagranzhovo-eĭlerovoï dyfuziĭnoï modeli LEDI provedenomodeliuvannia rozpovsiudzhennia 131I v atmosferi na terytoriï Ukraïny ta ĭogo osadzhennia na zemnu poverkhniu v pochatkovyĭ period Chornobyl's'koï avariï. Vkhidnymy danymy dlia modeli atmosfernogo perenesennia buly rezul'taty obchyslen' detalizovanykh poliv meteorologichnykh parametriv z vykorystanniam mezomasshtabnoï modeli prognozu pogody WRF, adaptovanoï dlia terytoriï Ukraïny.Rezul'taty. Na osnovi rezul'tativ modeliuvannia atmosfernogo perenesennia radioaktyvnykh vykydiv z avariĭnogo bloku ChAES z vykorystanniam suchasnoï mezomasshtabnoï modeli chysel'nogo prognozu pogody WRF rozrakhovanodobovi vypadannia ta seredn'odobovi ob’iemni aktyvnosti 131I v pryzemnomu shari povitria za period z 26 kvitnia po7 travnia 1986 roku dlia 30 352 naselenykh punktiv vsikh oblasteĭ Ukraïny, vkliuchaiuchy 1263 naselenykh punkty vKyïvs'kiĭ, 1717 – v Zhytomyrs'kiĭ ta 1570 – v Chernigivs'kiĭ oblastiakh.Vysnovky. Pokazano, shcho metod matematychnogo modeliuvannia atmosfernogo perenesennia radionuklidiv, poiednanyĭ z vykorystanniam suchasnoï mezomasshtabnoï modeli chysel'nogo prognozu pogody WRF, ie korysnym instrumentom dlia detal'noï rekonstruktsiï dynamiky poliv radioaktyvnogo zabrudnennia povitria i zemnoï poverkhni v gostryĭ period Chornobyl's'koï avariï. Utochnena ta rozshyrena za kil'kistiu naselenykh punktiv baza model'nykh znachen' dobovykh vypadan' ta seredn'odobovykh znachen' ob’iemnoï aktyvnosti 131I v pryzemnomu povitri mozhe buty vykorystana v zadachi rekonstruktsiï doz oprominennia shchytopodibnoï zalozy naselennia Ukraïny.
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